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Pré-Publication, Document De Travail Année : 2004

Foam in a two-dimensional Couette shear: a local measurement of bubble deformation.

Résumé

We re-analyse experiments on a foam sheared in a two-dimensional Couette geometry [Debrégeas et al., Phys. Rev. Lett. 87, 178305 (2001)]. We characterise the bubble deformation by a texture tensor. Our measurements are local in time: they show two regimes, one transient and one stationary. They provide both the average and fluctuations of the anisotropy. Measurements are also local in space: they show that both the deformation and the elastic contribution to the stress field do not localise, varying smoothly across the shear gap. We can thus describe the foam as a continuous medium with elastic properties.
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Dates et versions

hal-00000441 , version 1 (23-06-2003)
hal-00000441 , version 2 (28-07-2004)
hal-00000441 , version 3 (25-11-2004)

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Eric Janiaud, Francois Graner. Foam in a two-dimensional Couette shear: a local measurement of bubble deformation.. 2004. ⟨hal-00000441v3⟩
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